Japanese-fold books

Design  /  Avoid using fonts smaller than 5 pt or with very thin lines — their printability depends largely on the smoothness of the chosen paper. Gold and silver elements may not show well on very thin lines or small areas. For deep black areas, we recommend using CMYK 60/50/50/100.
Due to possible trimming inaccuracies, avoid using thin or unprinted borders around the edge of the page — even a 0.5 mm shift can make the border look noticeably uneven.

Layout  /  For a clean and elegant look, it’s common to start each main chapter or section on a right-hand (odd-numbered) page. Be sure to include blank pages in your submitted file where needed.
The inside front and back covers, along with the first and last pages of the inner content, will be glued together along a 7 mm strip.

Flap Cover  /  Flap covers are often used for author bios, recommendations, or summaries — they add a refined touch to the book.

Durability  /  Film lamination provides good durability for the cover — it’s strongly recommended if you want a product that holds up over time.

Binding  /  Standard hot-melt binding is suitable for most uses. If the book needs to withstand heavy use, we recommend PUR binding for extra strength.

General Setup  /  The most reliable file format is PDF/X-4 — it ensures optimal compression and proper embedding of fonts and colors. All images should be in CMYK color mode and 300 dpi resolution at actual size. If you're using extra (spot) colors, the printable areas must be vector-based.
If your design reaches the edge of the print, include a 3 mm bleed. Crop marks should be 3 mm long and placed 3 mm from the edge.